Ok heres one for you all. With all the current talk of so many units doing back to back tours. Why is there a some units sat around in barracks who have not been on tour for at least 4 years? Could these units help relieve the strain or not?

Ok heres one for you all. With all the current talk of so many units doing back to back tours. Why is there a some units sat around in barracks who have not been on tour for at least 4 years? Could these units help relieve the strain or not?